Table 1.

Echocardiographic measurements

	Dog's age, years
	2∗	2.25	2.5	4.5	5.5	6.5†	8.25
LVVd, mL/kg	3.75	2.41	3.4	3.65	3.61	3.44	7.2
95% ref int, mL/kg	1.45-2.99
LVVs, mL/kg	0.62	0.61	1.04	1.21	1.43	1.87	1.86
95% ref int, mL/kg	0.4-1.35
LVEF, %	83	75	69	67	60	46	74
95% ref int, %	46.7-80.7
LAD-LAX/weight0.309	1.87	1.62	1.96	2.16	2.31	2.36	3.34
95% ref int, cm/kg0.309	1.19-1.56

LAD-LAX, Left atrial diameter measured on the right parasternal long-axis four-chamber view; LVEF, left ventricular ejection fraction; LVVd, diastolic left ventricular volume, calculated using Simpson's rule and indexed to body weight; LVVs, systolic left ventricular volume, calculated using Simpson's rule and indexed to body weight; ref int, reference interval.

^∗Initial evaluation due to syncopal third-degree AV block, immediately followed by pacemaker implantation.

^†Tachycardia diagnosed.